small posters NSV, identification needed

[banog]

Hi,

recently I've got these four posters from the NSV.
Have you seen thus anywhere else? It seems they are from a series like the Wochensprüche der NSDAP.
Please post if you know more about them and maybe pics if you have more of this series.
They measures about DIN A4, 20x30cm.
What would be a reasonable price for these?

Thanks.